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Earnings per Share - Schedule of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Subsidiary, Sale of Stock [Line Items]
Net income - basic and diluted	$ 13.9	$ 32.1
Weighted-average shares outstanding:
Basic (in shares)	95.3	94.2
Effect of dilutive securities:
Diluted (in shares)	97.6	98.2
Earnings per share, basic (in USD per share)	$ 0.15	$ 0.34
Earnings per share, diluted (in USD per share)	$ 0.14	$ 0.33
Shares excluded from diluted per share amounts because their effect would have been anti-dilutive (in shares)	6.0	2.7
2.25% Convertible Senior Notes due 2024
Effect of dilutive securities:
2024 Notes (in shares)	0.5	1.4
Stock options
Effect of dilutive securities:
Effect of dilutive securities (in shares)	1.5	2.1
Restricted stock
Effect of dilutive securities:
Effect of dilutive securities (in shares)	0.3	0.5

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